function Map(el){
    this.el = el
    this.width = '800px'
    this.height = '400px'
    this.init()
}
Map.prototype.init =function(){
   this.map()
}
Map.prototype.map = function(){
    this.el.style.width = this.width
    this.el.style.height = this.height
    this.el.style.background = 'url(./bg.png)'
    this.el.style.border = '10px solid green'
    this.el.style.position = 'relative'
    //页面展示
   
}